Portable test instrument



FIG. 1 is a first oblique view of a first variant of a portable test instrument, taken from the front and left side, showing our new design;

FIG. 2 is another oblique view thereof, taken from the front and right side;

FIG. 3 is a front elevation view thereof,

FIG. 4 is a rear elevation view thereof,

FIG. 5 is a bottom plan view thereof,

FIG. 6 is a top plan view thereof,

FIG. 7 is a left side elevation view thereof; and,

FIG. 8 is a right side elevation view thereof.

The broken line showing of structural features is included for the purpose of illustrating non claimed subject matter and forms no part of the claimed design. 

CLAIM The ornamental design for a portable test instrument, as shown and described. 